Synacor Zimbra: Mehrere Schwachstellen
WID-SEC-2026-3977 · first 15.10.2026 · updated 15.10.2026 · CVSS 5,3
What it is about
Zimbra ist eine Groupware-Lösung, die E-Mail, Kalender und Aufgabenverwaltung bietet. Ein Angreifer kann mehrere Schwachstellen in Synacor Zimbra ausnutzen, um Sicherheitsvorkehrungen zu umgehen, und um Informationen offenzulegen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- Sicherheitsvorkehrungen zu umgehen
- Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Synacor Zimbra <=10.1.21
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
According to the BSI there is no update yet. The vendor notices below name interim protective measures, if any.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- GitHub Advisory Database vom 2026-10-14 github.com
- GitHub Advisory Database vom 2026-10-14 github.com
- PoCs für beide Schwachstellen www.rapid7.com
- PoC für CVE-2026-93635 github.com
- PoC für CVE-2026-93637 github.com
CVE: CVE-2026-93635, CVE-2026-93637
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.